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  1. #1

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    p-aminophenol in Rodinal staining negs?

    Quick question here.

    After very long stand developments (8h, 1:300) with Rodinal I've noticed a purple cast on the negatives. My only guess that this is the phenol in Rodinal. Out of curiosity I scanned a negative in RGB and the resulting output was a very ethereal extremely subtle blue/purple hue to the grays...

    Thanks

  2. #2
    df cardwell's Avatar
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    umm, what kind of film ?

  3. #3

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    Sorry APX 100, although I'm not sure the film type has to do with the cast.

  4. #4
    df cardwell's Avatar
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    Quote Originally Posted by fotoobscura View Post
    Sorry APX 100, although I'm not sure the film type has to do with the cast.
    because many of today's films have a purple cast regardless of the developer ?

  5. #5

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    35mm APX has a blue-gray cast, while 120 APX has a clear base (120 Rollei Retro has a blue-gray cast because it is cut from 35mm master rolls).

    What color is your Rodinal after development when you pour it out?

  6. #6

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    Hi Alexander,

    The Rodinal is dark purple.
    Thanks.

  7. #7

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    I thought that rodinal was a non-staining developer.

  8. #8
    df cardwell's Avatar
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    Quote Originally Posted by alanrockwood View Post
    I thought that rodinal was a non-staining developer.
    8 hours changes everything

  9. #9

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    Rodinal doesn't stain in regular development (1:25,50,100) but the sheer length of time sitting idle in the soup may cause this to occur. I've seen this with other long-term developments including yellow-cast negatives using Gigabit film.

    What validated this possibility (which is highly questionable) is that reading the detailed properties of p-anminphenol hcl it indicated the characteristics as "Purplish crystalline platelets."

    FWIW I shot the APX @ 25.

    I actually quite like the cast and so would like to figure it out to accurately reproduce in the future.

    Thanks

  10. #10

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    My Rodinal also turns dark purple when used with APX, although I do not use stand or semi-stand development, so my development times are much shorter than yours.

    Let us know if you find anything out from experimenting, fotoobscura. Thanks.

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